Economical whole-group mobile optical system

Abstract

The utility model relates to an economical whole-group movable optical system. The economical whole-group movable optical system comprises a front movable group, a diaphragm, a rear movable group and an imaging group which are sequentially arranged along an incident light path, the lenses with focal power of the front moving group along an incident light path are a biconvex positive lens and a biconcave negative lens A in sequence; and the rear moving group comprises a biconcave negative lens B, a meniscus positive lens and a plano-convex positive lens which are sequentially arranged along the incident light path and have focal power. The economical whole-set movable optical system is symmetrical in structure, small and exquisite in appearance, good in economical efficiency, high in resolution ratio and low in distortion, the pupil position, the aperture ratio and the field curvature of the system are optimized, and the stability and the reliability of the performance of the optical system are fully guaranteed so as to cope with the continuously-expanded industry market of a visual labeling machine and the continuous progress of the visual technology.

Description

Technical Field

[0001] This utility model relates to the field of optical systems, and in particular to an economical, modular, mobile optical system. Background Technology

[0002] With the increasing automation of industry and the rising demands for product packaging across various sectors, the labeling machine market has experienced rapid growth in recent years, particularly in the food, beverage, pharmaceutical, chemical, electronics, and machinery manufacturing industries, where its applications are becoming increasingly widespread. The global labeling machine market reached 43.283 billion yuan in 2023 and is projected to continue growing at a stable compound annual growth rate, potentially reaching 52.937 billion yuan by 2029. However, the labeling machine industry is facing increasingly fierce competition and new challenges. Traditional labeling machines rely on simple positioning methods, resulting in poor adaptability to changes in product position and shape, low accuracy, and the need for manual intervention and mechanical adjustments, thus limiting flexibility. Therefore, upgraded, more intelligent vision labeling machines offer the advantage of incorporating a vision system. This system allows for rapid adaptation to the labeling needs of products with different specifications and shapes. Through the vision system's recognition and adjustment, more precise labeling is achieved, demonstrating significant advantages. Furthermore, the vision system can monitor the labeling effect in real time, automatically detecting and correcting deviations during the labeling process, reducing the time and cost of manual intervention, thereby improving production efficiency, reducing costs, and ensuring product quality and consistency.

[0003] In the future, driven by continuous advancements in vision technology, the application scenarios of labeling machines will further expand, propelling the development of higher-precision machine vision. Therefore, designing an economical, high-resolution, and low-distortion optical system to complement the expanding market for vision-based labeling machines will become highly meaningful. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an economical mobile optical system that is compact, cost-effective, high-resolution, and low-distortion.

[0005] This utility model is implemented using the following scheme: an economical modular optical system, comprising a front moving group, an aperture, a rear moving group, and an imaging group arranged sequentially along the incident light path; the lenses with optical power in the front moving group along the incident light path are, in sequence, a biconvex positive lens and a biconcave negative lens A; the lenses with optical power in the rear moving group along the incident light path are, in sequence, a biconcave negative lens B, a meniscus positive lens, and a plano-convex positive lens.

[0006] Furthermore, the air distance between the front moving group and the rear moving group is 2.26 mm; the air distance between the front moving group and the aperture is 0.31 mm; and the air distance between the aperture and the rear moving group is 1.95 mm.

[0007] Furthermore, the biconvex positive lens and the biconcave negative lens A of the forward-moving group are bonded together as a glued assembly.

[0008] Furthermore, in the rear moving group, the air distance between the biconcave negative lens B and the meniscus positive lens is 0.39 mm; the air distance between the meniscus positive lens and the plano-convex positive lens is 0.1 mm.

[0009] Furthermore, the total focal length f of the optical system, the focal length f1 of the biconvex positive lens, the focal length f2 of the biconcave negative lens A, the focal length f3 of the biconcave negative lens B, the focal length f4 of the meniscus positive lens, and the focal length f5 of the plano-convex positive lens satisfy the following relationships: 0.83 < |f1 / f| < 1.24, 2.73 < |f2 / f| < 4.51, 0.40 < |f3 / f| < 0.67, 0.99 < |f4 / f| < 1.35, 1.38 < |f5 / f| < 1.84.

[0010] Furthermore, the refractive index of the biconvex positive lens is n1, and the Abbe number is V1, satisfying the relationships: 1.62 < n1 < 1.72, 37.5 < V1 < 41.0; the refractive index of the biconcave negative lens A is n2, and the Abbe number is V2, satisfying the relationships: 1.60 < n2 < 1.62, 34.5 < V2 < 40.5; the refractive index of the biconcave negative lens B is n3, and the Abbe number is V3, satisfying the relationships: 1.60 < n2 < 1.62, 34.5 < V2 < 40.5; The refractive index of a meniscus lens is n4 and its Abbe number is V4, satisfying the following relationships: 1.64 < n3 < 1.95, 18.0 < V3 < 20.0; the refractive index of a meniscus lens is n4 and its Abbe number is V4, satisfying the following relationships: 1.62 < n4 < 1.72, 37.5 < V4 < 41.0; the refractive index of a plano-convex lens is n5 and its Abbe number is V5, satisfying the following relationships: 1.62 < n5 < 1.72, 34.0 < V5 < 37.5.

[0011] Furthermore, the total optical power of the forward moving group is positive, the object-side and image-side surfaces of the biconvex positive lens are both convex, and the object-side and image-side surfaces of the biconcave negative lens A are both concave.

[0012] Furthermore, the total optical power of the rear moving group is positive, the object-side and image-side of the biconcave negative lens B are both concave, the object-side of the meniscus positive lens is concave and the image-side is convex, and the object-side of the plano-convex positive lens is convex and the image-side is planar.

[0013] Furthermore, the imaging group includes a flat lens and an imaging surface.

[0014] Furthermore, the air distance between the flat lens and the imaging surface is 0.2 mm.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention is an economical, fully mobile optical system with a symmetrical structure, compact size, good economy, high resolution, and low distortion. It optimizes the pupil position, aperture ratio, and field curvature of the system, fully ensuring the stability and reliability of the optical system performance, so as to cope with the ever-expanding industry market of vision labeling machines and the continuous progress of vision technology.

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the optical system according to an embodiment of the present invention;

[0018] Figure 2 This is an MTF curve (300mm object distance) of the optical system of this utility model embodiment.

[0019] Figure 3 This is an MTF curve (600mm object distance) of the optical system of this utility model embodiment.

[0020] Figure 4 This is an MTF curve of the optical system of this utility model embodiment (object distance 1500mm).

[0021] Figure 5 This is an MTF curve (object distance at infinity) of the optical system according to an embodiment of this utility model.

[0022] Figure 6 This is a field curve diagram (300mm object distance) of the optical system of this utility model embodiment;

[0023] Figure 7 This is a field curve diagram of the optical system of this utility model embodiment (object distance 600mm).

[0024] Figure 8 This is a field curve diagram of the optical system of this utility model embodiment (object distance 1500mm).

[0025] Figure 9 This is a field curve diagram of the optical system of this utility model embodiment (object distance at infinity);

[0026] Figure 10 This is a distortion diagram of the optical system of this utility model embodiment (object distance 300mm);

[0027] Figure 11 This is a distortion diagram of the optical system of this utility model embodiment (object distance 600mm);

[0028] Figure 12This is a distortion diagram of the optical system of this utility model embodiment (object distance 1500mm);

[0029] Figure 13 This is a distortion diagram of the optical system (object distance at infinity) according to an embodiment of this utility model.

[0030] The labels in the diagram are as follows: M1 - forward moving group, ST - aperture stop, M2 - rear moving group, IMA - imaging group, 1 - biconvex positive lens, 2 - biconcave negative lens A, 3 - biconcave negative lens B, 4 - meniscus positive lens, 5 - plano-convex positive lens. Detailed Implementation

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] like Figure 1 As shown, an economical modular optical system includes a front moving group, an aperture, a rear moving group, and an imaging group arranged sequentially along the incident light path; the lenses with optical power in the front moving group along the incident light path are, in sequence, a biconvex positive lens and a biconcave negative lens A; the lenses with optical power in the rear moving group along the incident light path are, in sequence, a biconcave negative lens B, a meniscus positive lens, and a plano-convex positive lens.

[0034] In this embodiment, the air distance between the front moving group and the rear moving group is 2.26 mm; the air distance between the front moving group and the aperture is 0.31 mm; and the air distance between the aperture and the rear moving group is 1.95 mm.

[0035] In this embodiment, the biconvex positive lens and the biconcave negative lens A of the forward moving group are bonded together to form an adhesive assembly.

[0036] In this embodiment, in the rear moving group, the air distance between the biconcave negative lens B and the meniscus positive lens is 0.39 mm; the air distance between the meniscus positive lens and the plano-convex positive lens is 0.1 mm.

[0037] In this embodiment, the total focal length f of the optical system, the focal length f1 of the biconvex positive lens, the focal length f2 of the biconcave negative lens A, the focal length f3 of the biconcave negative lens B, the focal length f4 of the meniscus positive lens, and the focal length f5 of the plano-convex positive lens satisfy the following relationships: 0.83 < |f1 / f| < 1.24, 2.73 < |f2 / f| < 4.51, 0.40 < |f3 / f| < 0.67, 0.99 < |f4 / f| < 1.35, 1.38 < |f5 / f| < 1.84.

[0038] In this embodiment, the refractive index of the biconvex positive lens is n1 and the Abbe number is V1, satisfying the relationships: 1.62 < n1 < 1.72, 37.5 < V1 < 41.0; the refractive index of the biconcave negative lens A is n2 and the Abbe number is V2, satisfying the relationships: 1.60 < n2 < 1.62, 34.5 < V2 < 40.5; the refractive index of the biconcave negative lens B is n3 and the Abbe number is V3, and... The following relationships are satisfied: 1.64 < n3 < 1.95, 18.0 < V3 < 20.0; the refractive index of the meniscus lens is n4 and the Abbe number is V4, satisfying the following relationships: 1.62 < n4 < 1.72, 37.5 < V4 < 41.0; the refractive index of the plano-convex lens is n5 and the Abbe number is V5, satisfying the following relationships: 1.62 < n5 < 1.72, 34.0 < V5 < 37.5.

[0039] In this embodiment, the total optical power of the forward moving group is positive. Both the object-side and image-side surfaces of the biconvex positive lens are convex, and both the object-side and image-side surfaces of the biconcave negative lens A are concave. The biconvex positive lens is a flint biconvex lens, and the biconcave negative lens A is a flint biconcave lens; the two are bonded together to form a cemented lens. The bonding of the positive optical power biconvex positive lens and the negative optical power biconcave negative lens A enhances structural reliability, reduces light reflection loss on the two cemented surfaces, prevents total internal reflection in the air gap, improves light transmittance, improves system aberrations, and ensures system performance.

[0040] The optical system uses a whole-group moving focusing method to achieve an optical imaging range of 300mm to infinity: when the object distance is 300mm, the air distance between the rear moving group M2 and the imaging group IMA is 10.8mm; when the object distance is at infinity, the air distance between the rear moving group M2 and the imaging group IMA is 10.0mm.

[0041] In this embodiment, the total optical power of the rear moving group is positive. The object-side and image-side surfaces of the biconcave negative lens B are both concave, the object-side surface of the meniscus positive lens is concave and the image-side surface is convex, and the object-side surface of the plano-convex positive lens is convex and the image-side surface is planar. The fifth lens is designed as a plano-convex positive lens, which has a simple design structure, economical manufacturing cost, and is easy to process and manufacture. Because the plano-convex lens refracts only on one side, the aberration is relatively smaller, the image quality is higher, and it can provide better optical performance, effectively ensuring the yield rate of production and assembly.

[0042] In this embodiment, the imaging group includes a flat lens and an imaging surface.

[0043] In this embodiment, the air distance between the flat lens and the imaging surface is 0.2 mm.

[0044] The optical system achieves the following technical specifications: f=16mm, relative aperture: F / #=2.8, image plane size ≤φ11mm, and working wavelength: FdC (visible).

[0045] To achieve the above design parameters, the specific parameters of each lens in the optical system of this embodiment are shown in Table 1:

[0046] Table 1. Data for each lens in the optical system (unit: mm)

[0047]

[0048] Figures 2-5 MTF curve of the optical system: such as Figure 2 The figure shows MTF ≥ 0.25@200lp / mm and MTF ≥ 0.4@125lp / mm at an object distance of 300mm. Figure 3 The figure shows MTF ≥ 0.25@200lp / mm and MTF ≥ 0.4@125lp / mm at a 600mm object distance. Figure 4 The figure shows MTF ≥ 0.25@200lp / mm and MTF ≥ 0.4@125lp / mm at an object distance of 1500mm. Figure 5 The figure shows the MTF at infinity object distance, with values ​​of MTF ≥ 0.25@200lp / mm and MTF ≥ 0.4@125lp / mm.

[0049] Figures 6-9 The field curve of the optical system is as follows: Figure 6 As shown, at an object distance of 300 mm, the field curvature in the figure is ≤ ±0.08 mm; Figure 7 As shown, at an object distance of 600 mm, the field curvature in the figure is ≤ ±0.08 mm; Figure 8 As shown, at an object distance of 1500mm, the field curvature in the figure is ≤ ±0.08mm; Figure 9As shown, at an object distance of infinity, the field curvature in the figure is ≤ ±0.08 mm.

[0050] Figures 10-13 For optical system distortion diagrams: such as Figure 10 As shown, at an object distance of 300 mm, the optical distortion is ≤ ±0.1%; Figure 11 As shown, at an object distance of 600 mm, the optical distortion is ≤ ±0.1%; Figure 12 As shown, at an object distance of 1500mm, the optical distortion is ≤±0.1%; Figure 13 As shown, at an object distance of infinity, the optical distortion is ≤ ±0.1%.

[0051] The optical system consists of four groups of five spherical lenses and uses a whole-group moving focusing method for focusing. It has a symmetrical structure, compact size, and economical cost. The design process fully considers the shape and surface of each optical lens and carefully fine-tunes the parameters such as lens position and curvature. It optimizes the pupil position, aperture ratio, and field curvature of the system, and fully ensures the stability and reliability of the optical system performance.

[0052] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0053] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0054] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0055] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. An economical, modular, mobile optical system, characterized in that: It includes a front moving group, an aperture stop, a rear moving group, and an imaging group arranged sequentially along the incident light path; the lenses with optical power in the front moving group along the incident light path are, in sequence, a biconvex positive lens and a biconcave negative lens A; the lenses with optical power in the rear moving group along the incident light path are, in sequence, a biconcave negative lens B, a meniscus positive lens, and a plano-convex positive lens.

2. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The air distance between the front moving group and the rear moving group is 2.26 mm; the air distance between the front moving group and the aperture is 0.31 mm; and the air distance between the aperture and the rear moving group is 1.95 mm.

3. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The biconvex positive lens and biconcave negative lens A of the forward-moving group are bonded together as a glued assembly.

4. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: In the rear moving group, the air distance between the biconcave negative lens B and the meniscus positive lens is 0.39 mm; the air distance between the meniscus positive lens and the plano-convex positive lens is 0.1 mm.

5. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The total focal length f of the optical system, the focal length f1 of the biconvex positive lens, the focal length f2 of the biconcave negative lens A, the focal length f3 of the biconcave negative lens B, the focal length f4 of the meniscus positive lens, and the focal length f5 of the plano-convex positive lens satisfy the following relationships: 0.83 < |f1 / f| < 1.24, 2.73 < |f2 / f| < 4.51, 0.40 < |f3 / f| < 0.67, 0.99 < |f4 / f| < 1.35, 1.38 < |f5 / f| < 1.

84.

6. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The refractive index of the biconvex positive lens is n1, and the Abbe number is V1, satisfying the following relationships: 1.62 < n1 < 1.72, 37.5 < V1 < 41.0; the refractive index of the biconcave negative lens A is n2, and the Abbe number is V2, satisfying the following relationships: 1.60 < n2 < 1.62, 34.5 < V2 < 40.5; the refractive index of the biconcave negative lens B is n3, and the Abbe number is V3, satisfying the following relationships: 1.64 < n3 < 1.95, 18.0 < V3 < 20.0; the refractive index of the meniscus positive lens is n4, and the Abbe number is V4, satisfying the following relationships: 1.62 < n4 < 1.72, 37.5 < V4 < 41.0; the refractive index of the plano-convex positive lens is n5, and the Abbe number is V5, satisfying the following relationships: 1.62 < n5 < 1.72, 34.0 < V5 < 37.

5.

7. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The total optical power of the forward moving group is positive, the object-side and image-side of the biconvex positive lens are both convex, and the object-side and image-side of the biconcave negative lens A are both concave.

8. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The total optical power of the rear moving group is positive. The object-side and image-side surfaces of the biconcave negative lens B are both concave. The object-side surface of the meniscus positive lens is concave and the image-side surface is convex. The object-side surface of the plano-convex positive lens is convex and the image-side surface is planar.

9. The economical, fully-assembled mobile optical system according to claim 1, characterized in that: The imaging group includes a flat lens and an imaging surface.

10. The economical, fully-assembled mobile optical system according to claim 9, characterized in that: The air distance between the flat lens and the imaging surface is 0.2 mm.

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